Unicorn fish derive their name from the protrusion of their head which is similar to that on unicorns. Unicorn Fish Quick Facts Scientific Name: Naso Size: 70 cm in Length Height: 51-61 cm Average Lifespan: Around 15 years Color: Have a color changing ability Habitats: Tropical Waters around Coral Reef and Aquarium Fun Facts: Unicorn Fish is commonly found in tropical locations such as the Indian and Pacific oceans. ... Full Story